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Finding the Fourth Proportional to 13,290, 19,947.30 and 6,720.80

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Solution

The fourth proportional to 13,290, 19,947.30 and 6,720.80 is: 10,087.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,290 : 19,947.30 = 6,720.80 : x
  2. Step 2: Convert to fraction form
    13,290/19,947.30 = 6,720.80/x
  3. Step 3: Cross multiply
    13,290x = 19,947.30 × 6,720.80
  4. Step 4: Simplify right side
    13,290x = 134,061,813.84
  5. Step 5: Solve for x
    x = 134,061,813.84/13,290
  6. Step 6: Final answer
    x = 10,087.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.